All,
I have a theoretical question regarding carbon blistering and use of a relatively viscous barrier fluid such as mineral oil. As I understand it blister patches are created on the carbon face from high shear forces due to higher viscosity fluids. In my experience, the majority of the time...
All. Thanks for the feedback. The coupling vendor will be on-site this week to discuss our options. This was great dialogue and I gained some valuable information.
All,
I have an application where we are experiencing premature pump / motor coupling failures. We are using a Hytrel elastomeric toothed, shear, sleeve and flange coupling. The motor is equipped with a VFD that operates in steps starting at 3600rpm then steps down to 2700rpm then to 1800rpm...
Can I expect to see shaft deflection for a standard centrifugal pump operating to the far right of the pump curve? If so, what would the mechanism for which the excessive radial forces would be generated? I would expect to see signs of clasical cavatitation as the NPSHr increases as flow...
All,
Regarding air compressors where the condensate (water/oil mixture) is collected in a knock out drum just after the compressor.
My question is can anyone confirm the ppm of oil in the water/oil mixture that is allowed to be piped to the waste water treatment facility?
I am looking for an acceptable o-ring material to be used is a mechanical seal made of zirconium metals for a sulfuric acid application. The process is sulfuric acid (67% concentration) at a temperature 250F. I have tried various componds (Kalrez 6375 and Viton)with marginal success. I am...
* It is a full cartridge seal. The intial install replaced the the entire cartridge seal. The second install just repaired the first set and re-installed them.
* The inner faces do see ID pressure. The stationary face is retained with a retaining ring that is held in place with a snap ring.
*...
All,
I am experiencing repeated mechanical seal failures on double suction, radially split, between bearings pump. The operating conditions are listed below.
Fluid – Hydrocarbon
Operating Temperature – 485F
Suction Pressure – 30psig
Discharge Pessure – 200psi
Barrier Fluid – Royal Purple 22...
I have an application where an API plan 54 is used. A recent failure had heavy coke build-up on the atmosheric side of the mechanical seal. The barrier fluid is Synturian Six at 100psig and 4gpm. The process is heavy gas oil at 700 degF. The first thing that pops in my head is...The plan 54...
Thanks for the pointers. We plan to pull the leaking sister pump next week. At that point I will have a better idea of what is going on with the seal / pump. Again thanks for the input.
Flexibox - Thanks for the feedback. Some more specific information is below.
The barrier fluid is Royal Purple 22 @ 225psig and 150F. The shaft speed is 3550rpm. The shaft size is 2.875". The inner and outer faces are antimony carbon vs. silicon carbide 1. The seal is a dual pressurized...
Hello all,
I have an application where I suspect nitrogen entrainment of barrier fluid is an issue but I'm not 100% certain.
For an API Plan 53A what seal pot pressure does N2 entrainment begin to become a concern?
When analyzing failed seal parts what signs of damage may indicate N2...
